• Scientific American 1931-04 1955 visits Scientific American 1931-04
  • Scientific American 1925-08 1273 visits Scientific American 1925-08
  • Scientific American 1925-10 1153 visits Scientific American 1925-10
  • Scientific American 1927-09 1437 visits Scientific American 1927-09
  • Scientific American 1927-10 1157 visits Scientific American 1927-10
  • Scientific American 1928-07 1072 visits Scientific American 1928-07
  • Scientific American 1928-09 1382 visits Scientific American 1928-09
  • Scientific American 1928-10 1600 visits Scientific American 1928-10
  • Scientific American 1928-11 1075 visits Scientific American 1928-11
  • Scientific American 1929-02 1449 visits Scientific American 1929-02
  • Scientific American 1929-08 1590 visits Scientific American 1929-08